I’m not just referring to the, uh, directional aspects of medical transition, though, but gendered experiences more broadly. For example, when I was in junior high, a social worker at school taught me to put on makeup. The WTFness of that is something that I’m going to want to discuss primarily with people who were perceived as gender non-conforming girls as teenagers [edit: including those who grew up to be women]. Being afab is not a requirement for that experience, but people with that experience or similar are going to be overwhelmingly afab. I get something different from talking about gender with trans people with experiences that are substantially different to mine (both people with different genders to mine, people with different experiences of gender pre-transition even if their actual genders aren’t all that different). I’m not saying that people aren’t prone to overgeneralization (there sure as hell are a lot of people out there acting like all non-binary people have genders that might be described as adjacent to “woman”), nor that gender assigned at birth isn’t something that people aren’t prone to overgeneralizing about, but your claim that it’s wholly irrelevant is preposterous.
If you want to make your assigned sex at birth a part of who you are, I won’t stop you, but to me, I’m not comfortable doing it. Being comfortable with your assigned sex is literally just what being cis is, and I’m not even remotely cis.
You realise this is saying “Well I guess I’m more trans than you”?